جستجوی مقالات مرتبط با کلیدواژه "marine biodiversity" در نشریات گروه "زیست شناسی"

Benthic macrofauna has a pivotal role in the energy flow and material cycles of marine ecosystems. Abiotic and biotic factors determine the presence and distribution of benthic macrofauna. The present study investigated possible relationships between benthic macrofauna and natural abiotic factors along the coastal region of the Gulf of Oman, including the north of Chabahar Bay, Konarak, and Tis. This was achieved through survey of the supra-littoral and intertidal zones at low tide, during the cold and warm seasons. In each zone, nine transects were sampled at random using quadrats. Then, sediment characteristics and macrofaunal abundance were determined. Mollusks and ‎echinoderms had the highest and the lowest species richness, respectively. The average values for the Shannon–Wiener index of the transects at Tis, north of Chabahar Bay, and Konarak were 3.22, 3.28, and 3.20 in the warm season, respectively, while the index reached 3.29, 3.47, and 3.17 in the winter. Regardless of seasonality, the level of biodiversity was at a maximum in the northern part of Chabahar Bay, and Konarak showed the minimum biodiversity. The results of multi-linear regression analysis proposed that non-biological factors are suitable proxies for predicting the levels of species density in the study regions (R2= 0.72, F(6,71) = 2.25, p< 0.05).

An annotated checklist of the extant burrowing shrimps (infraorders Axiidea and Gebiidea) of southern waters of Iran is presented for the first time. Six species of Gebiidea and 18 species of Axiidea have been documented from the southern waters of Iran, based on published literature. The species belong to six families: Upogebiidae (6 species), Axiidae (1), Callianassidae (5), Callianideidae (1), Callichiridae (9) and Ctenochelidae (2). The Persian Gulf with 18 species appears to be more diverse than the Gulf of Oman with four species, and two species are common in the both gulfs. Corallianassa martensi (Miers, 1884) is recorded for the first time across the Iranian coast. The present finding is based on specimens collected from the Chabahar, Gulf of Oman coast. A brief diagnosis and illustrations of C. martensi are provided.